Bed-plate and segment for beating-engines and the like.



JUDSGN A. DE CEW, OF MONTREAL, QUEBEC, CANADA.

BED-PLATE AND SEGMENT FOR BEATZNG-ENGINES AND THE LIKE'.

Specificaton of Letters Patent.

Patented Dem ta, inis.

Application filed August 11, 1916. Serial Ne, M l-,475.

TO all whom *it 'may concern:

Be it known that I, JUDsoN A. DE CEW, a subject of the King of Great Britain, and resident of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain n w and useful.

lmprovements in Bed-Plates and Segments :tor Beating-Engines and the like, of which the following is a full, clear, and exact description.

This invention rela-tes to an improved material to be used for the segments and bed plat es of pulp heating engines and similar nachinery.

At the present time, the materials most generally used are basalt lava or metallic knives. The knives have a cutting rather than a rubbing or brushing out action necessary to separate the fibers ot' the material, and are theretore of limited usefulness. The bas-alt lava is used on account of its hard and open or bubbly texture, which provides a multitude of pockets having edges over which the fragments of raw material 'are dragged or brushed, with the result that the fibers are separated. The great disadvantage of this material is the diliculty of obtaining it in suitable grades. Sometimes the stone is too hard and fine grained and sometimes so soft that it wears or crumbles away very rapidly. Furthermore, it sometimes happens that the pockets become filled with very closely compacted pulp material, so that the edges are covered and the brushing or rubbing action is lost. The o'bvious results of any of the faults mentioned are a poor grade of pulp and in the case of the last mentianed, the necessity of dressing the stone segments and bed plate, to remove the accumulations of compacted pulp and pre-` sent fresh edges at the working surface. This operation means a considerable loss of time and a rapid W'asting of the stone segments.

The material forming the subject of this inyention is designed to be of a non-clogging nature, so that it may be continuously used, and is also designed to have a rough or gritty texture, so that the brushing or rubbing action necessary to separate the fibers will be brought to a high degree of efficiency. The material consists briefiy of a body of cementitious or other material, in which are embedded a multitude of small metal wires extending perpendicularly to the working surface. i

In the drawing which illustrates the inventonz- The figure is a sectional View of a fragment of the improved material taken perpendicularly to the working surface.

Referring more particularly to the drawing, ll designates a body or binder of cementitious or other suitable material or composition, which will be suliiciently hard'and gritty or rough textured to produce the desired brushing action. Bedded in the material and preferably extending the whole thickness thereof are a multitude of small metal wires 12 which extend ,perpendicularly to the working surface. The relative hardness of the body ll and wires 12 is such that the body Will wear more rapidly than the wires, so that the working surface of the material is mechanically roughened by the projection of the ends of the wires. This projection of the wires forms in ettect pockets or tortuous passages on the surface, through which the pulp material passes.

The projection of the wires also protects' the body material 11 against undue wear. The body material 11 may be composed of Portland cement alone or mixed with a small amount of fine grained sharp sand, carborundunr, or even fine metal particles. Water repellant material may be added. While Portland cement has alone been specifically referred to, it will be understood that the invention is not limited to this, as other 'cementitious material may be used, also materials of a non-cementitious character, such as materials formed by heating or vulcanizing processes, or even metals or alloysQ If the binding material becomes worn down too far below the ends of the wires to insure the proper brushing or rubbing effect, the segments may be very quickly and easily dressed by grinding off a small amount of the projecting wire ends, but with proper selection of materials, it is not expected that this will be necessary except at 'nu-e ner- Vi 15. so that the material may be consere& as contnnousy eficen.

Having thua described my nvention, What claim is:

A material for use in the segmente, and bed phtes of pulp beung engines comp'sing a body of bindng material of grtt r 01' abrasve character having; a Eubbng or 10 b'ushng e'ect on fibrons material, and u mnltnde of metal Wres hzrdei' tham the bndng body in substan'cally pul-&Mel rela ton and exendng to the working su'fnve to present their ends ut. he Working surface.

in wtness whe'eof E have hereunto set my hand in the presence of two witnesses.

JY BSCK A. DE CEW.

S. E. V. ALLEN,

M. MURELAXD. 

